JP2527865B2 - Container manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing a container,
In particular, the present invention relates to a method of manufacturing a container having a protrusion protruding laterally beyond the maximum outer diameter surface position of the container body.

[0002]

Blow molding is generally known as a method for manufacturing a synthetic resin container.

In particular, those having a complicated shape such as a washer tank of an automobile are often manufactured by direct blow molding, which is advantageous for forming a variety of molded products.

4 and 5 show a conventional example in which a washer tank of an automobile is molded by this direct blow molding.

The washer tank 10 has a plurality of mounting portions 14 projecting laterally beyond the surface position of the maximum outer diameter of the tank body 12, so that the washer tank 10 can be mounted in the engine room of an automobile through the mounting portions 14. It has become.

When the washer tank 10 is molded, a cylindrical parison 18 having an outer diameter larger than the distance between the ends of the mounting portion 14 at the maximum protruding position is formed from the die core 16 of the extrusion molding machine. Extruded, this parison 1
When 8 reaches a predetermined length, the mold 20 located below the die core 16 is closed by the mold clamping mechanism to sandwich the parison 18.

In this case, the both sides 22 of the matching surface of the parison 18 are crushed by the mold 20, and the mounting part 14 is molded by the mold 20.

Next, a blow pin (not shown) is driven into the mold 20 from below the mold 20 to blow air to mold the parison 18 along the shape of the mold 20.

After cooling the mold 20 by cooling the mold 20 and blowing cooling air, the mold 20 is taken out from the mold 20 and the burrs 24 adhering around the mold are removed to obtain a finished product. I have to.

[0010]

In manufacturing the washer tank 10 by the conventional blow molding, the mold 2 is used.
The both sides 22 of the parison 18 at the mold matching position of 0 are sandwiched by the mold 20, and the mounting part 14 is molded by the mold 20 in the sandwiched part, and the mounting part 14 is attached to the tank body 12.
Since it is integrally formed with the tank body 12, burrs are formed not only on the upper and lower sides of the tank body 12 but also on both side portions 22, so that burrs 24 are generated over the entire circumference of the tank body 12. As a result, a large amount of burrs 24 are formed and the waste of the material is large and the yield of the material is low.

Further, since the burr 24 is formed over the entire circumference of the tank body 12, it is difficult to remove the burr 24, and since a large amount of burr 24 must be removed, the deburring process is troublesome and time-consuming. There was a problem that it took a lot of time.

Further, when the mounting portion 14 is to be integrally molded with the tank body 12, the die-matching surface of the die 20 is attached to the mounting portion 1.
4 must pass through the forming position, so that the parting line of the mold 20 becomes a complicated state as shown in the burr removal line 26 shown in FIG. There was a problem that it became expensive.

Further, the parison 1 is formed by the mold 20.
When the blow molding is performed with the both side portions 22 of 8 sandwiched, the parison 18 is pulled by the both side portions 22, and becomes thinner as the distance from the both side portions 22 increases,
In particular, in the case of an irregular shape, a thin portion may locally occur, so in order to make this portion the minimum required thickness in the standard, it is necessary to set the thickness of the parison 18 to a thickness corresponding to it. Therefore, there is a problem in that there is a portion where the wall thickness becomes thicker than necessary in the vicinity of the both side portions 22 and the material is wasted.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reduce the amount of burrs generated during blow molding, to reduce the waste of materials, and to improve the yield. The burr removal work is facilitated to shorten the work time, the parting line of the mold is simplified, the mold manufacturing is facilitated and the cost is reduced, and the wall thickness of the parison is minimized. Another object of the present invention is to provide a container manufacturing method capable of eliminating the waste of the above.

[0015]

In order to achieve the above object, the method of manufacturing a container according to the present invention is a method of manufacturing a container having a projection protruding laterally at least from the maximum outer diameter surface position of the container body. Then, after forming a container body in a state where there is no protrusion projecting laterally beyond the maximum outer diameter surface position by blow molding, the protrusion formed by a molding process separately from the container body It is characterized by being welded to a predetermined position of the main body. In addition, another aspect of the present invention
In addition to the state of the invention, is a container book for welding the protrusion.
The body is in place on the reinforcing ribs formed on the container body
It is characterized by that.

[0016]

In the container manufacturing method of the present invention having the above-mentioned structure, the mold is formed by blow molding the container main body in which there is no protrusion protruding laterally from the maximum outer diameter surface position. With this, it is not necessary to pinch both sides of the parison, the outer diameter of the parison can be reduced accordingly, and since burrs do not occur on both sides of the container body,
Therefore, it is possible to reduce the amount of waste of material and improve the yield. Moreover, it is only necessary to remove the burrs at the top and bottom of the container body, the removal work is easy, and the work time can be shortened.

Further, the parting line of the mold can be set without considering the protrusions, which facilitates the manufacture of the mold and reduces the cost.

Furthermore, blow molding can be performed in a state where both sides of the parison are free, and since there is no tension on both sides of the parison as in the conventional case, the parison can be uniformly molded, and therefore the thickness of the parison is increased. Can be set in a minimum state, and waste of material can be eliminated. Also,
By welding the protrusions on the reinforcing ribs formed on the main body
Prevents deformation of the container body during welding pressurization and ensures reliable welding.
Can be performed, and as a result, it is difficult to remove the protrusion.
Can be.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 3 are views showing an embodiment for producing a washer tank for an automobile by using the method for producing a container according to the present invention.

As shown in FIG. 2, this washer tank 30 has a tank body 32 formed in a different shape according to the state of the gap in the engine room so that the gap in the engine room of the automobile can be effectively utilized. , This tank body 32
It is provided with a plurality of mounting portions 34, 36, 38 which are further projected.

These mounting portions 34, 36, 38 are in a state of protruding laterally beyond the maximum outer diameter surface position of the tank body 32, and the mounting portions 34, 36 have a side surface 40.
Is installed near the corners of the
The tank body 32 is attached near the center of the front surface 42.

The mounting portions 34, 36 and 38 are
Each of them is integrally welded to a predetermined position of the tank body 32 by heat welding or the like. Especially the tank body 32
The mounting portion 38 mounted near the center of the front face 42 of
Since it may be deformed by the applied pressure during welding,
As shown in FIG. 3, the reinforcing ribs 4 are longitudinally provided near the center of the front surface 42 of the tank body 32 to which the mounting portion 38 is attached.
4 is formed to prevent deformation of the tank body 32.

Next, the manufacturing process of the washer tank 30 will be described.

First, as shown in FIG. 1, the tank main body 32 is formed by blow molding without the mounting portions 34, 36, 38 protruding laterally from the maximum outer diameter surface position. This blow molding process is performed by a direct blow molding machine that is easy to manufacture an irregularly shaped product. First, the cylindrical parison 48 is extruded downward from the die core 46 of the extrusion molding machine.

The cylindrical parison 48 is set to have an outer diameter smaller than the maximum outer diameter surface position of the tank main body 32 to be molded, and the maximum outer diameter surface position of the tank main body 32 shown by a two-dot chain line in FIG. It is much smaller than the conventional parison with a larger outer diameter, and it is possible to save molding material compared to the conventional one.

Next, when the parison 48 reaches a predetermined length, a mold clamping mechanism (not shown) is activated and the mold 5 in the divided state.
Close 0 and go across the parison 48. In this case, the parison 48 is sandwiched between the upper and lower positions of the mold 50, but the parison 48 is not caught by the mold 50 in the maximum outer diameter portion of the tank main body 32 and is free in the mold 50. There is.

Next, a blow pin (not shown) is driven in from the lower side of the die 50 to blow air into the parison 48 for blow molding.

In this case, the parison 48 is clamped only in the upper and lower parts by the mold 50, and in the middle outer diameter portion of the tank main body 32, the parison 48 is in a free state without being caught by the mold 50. The degree of freedom of the parison 48 in the mold 50 is increased, and molding with a uniform wall thickness can be performed. Therefore, as in the conventional case, both sides of the maximum outer diameter portion are sandwiched by the mold, the parison is less likely to be pulled to both sides during blow molding, and a thin portion is less likely to occur, and the thickness of the parison 48 is minimized. It is possible to suppress the waste of material.

Further, the mounting parts 34 and 3 are formed by the mold 50.
Since it is not necessary to mold 6, 38, the parting line for mold matching of the mold 50 can also be formed in a simple state as shown by the line 52 in FIG. Manufacture becomes easy, and cost reduction becomes possible.

After molding the parison 48 into a predetermined shape along the shape of the mold 50, cooling the mold 50 and blowing cooling air from the blow pins to cool the molded product, the burr 54 is removed. If removed, the mounting parts 34, 3
Thus, the tank main body 32 is formed in a state where there is no 6, 38.

In this case, the burr 54 exists only above and below the tank main body 32, and it is needless to say that the waste of material can be omitted.
Moreover, the upper and lower burrs 54 can be cut off with a mold,
The deburring work becomes easy and the time required for the deburring work can be shortened.

In addition to the molding of the tank body 32, the mounting portion 3 is manufactured by a separate process using an injection molding machine or the like.
4, 36 and 38 are molded.

Then, as described above, the attachment portions 34, 36, 38 formed by injection molding or the like are attached to the predetermined positions of the tank body 32 formed by blow molding by welding by heat welding or the like. The washer tank 30 as a finished product can be easily manufactured.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the gist of the invention.

For example, in the above embodiment, the washer tank 30 having the mounting portions 34, 36, 38 is shown as an example of the container, but the present invention is not limited to this.
The present invention can also be applied to a container having at least a handle that projects laterally beyond the maximum outer diameter surface position of the container body and other projecting portions.

Further, the protrusion which does not reach the maximum outer diameter surface position of the container body may be molded separately and then welded, or may be integrally molded with the container body, whichever is appropriately selected. I will get it.

Further, in the above embodiment, the reinforcing rib 44 is formed near the center of the front surface 42 of the tank main body 32, and the mounting portion 38 is mounted on the reinforcing rib 44, but the present invention is not limited to this example. If the vicinity of the center of the front surface 42 is of a degree that can sufficiently withstand the welding pressure, the reinforcing ribs 44 can be omitted.

[0039]

As described above, according to the method of manufacturing a container of the present invention, the container main body is formed by blow molding without a projection protruding laterally from the maximum outer diameter surface position. As a result, it is not necessary to pinch both sides of the parison with the mold, and the outer diameter of the parison can be made smaller, and burrs do not occur on both sides of the container body. In addition, the yield can be improved, and the removal work of the burrs at the top and bottom of the container body can be performed easily, and the work can be performed in a short time.

Further, the parting line of the mold can be set without considering the protrusion, and the parting line can be simplified accordingly, and therefore, the mold can be easily manufactured and the cost can be reduced. There is an effect.

Furthermore, blow molding can be performed with both sides of the parison free, and since there is no tension on both sides of the parison as in the conventional case, the parison can be uniformly molded, and therefore the meat of the parison can be formed. There is an effect that the thickness can be set in the minimum state and the waste of the material can be omitted. And furthermore, on the reinforcing rib formed on the container body
By welding the protrusions, the container body does not change when the welding pressure is applied.
Prevents shape and ensures reliable welding, resulting in
This has the effect of making it difficult to remove the protrusions.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a tank body of a washer tank is blow-molded by using a container manufacturing method according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a mounting portion is welded to the container body molded according to FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view showing a state in which a conventional washer tank is manufactured by blow molding.

5 is a perspective view of the washer tank formed according to FIG. 4. FIG.

[Explanation of symbols]

30 washer tank as a container 32 Tank body as a container body 34, 36, 38 Mounting portion as a protrusion 48 Parison 50 Mold 54 Burr
AS012101

Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location // B29L 22:00 B29L 22:00 (72) Inventor Hiroo Fujii 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Kun Yasuda 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Shoji Suzuki 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (56) Reference JP-A-52-46985 (JP) , A) Japanese Patent Laid-Open No. 55-57431 (JP, A) Actually developed 54-85164 (JP, U)

Claims (2)

(57) [Claims] 1. A method of manufacturing a container having at least a protrusion projecting laterally beyond the maximum outer diameter surface position of the container body, wherein there is no protrusion projecting laterally beyond the maximum outer diameter surface position. A method for manufacturing a container, comprising forming a container body in a state by blow molding, and then welding the protrusion formed by molding separately from the container body to a predetermined position of the container body. 2. The method according to claim 1, The predetermined position of the container body where the protrusion is welded is
Manufacture of a container characterized by being on a formed reinforcing rib
Method.